[Shtoom] doug DTMF problems when connected to asterisk

Hi,
I'm trying to build some doug app connected to asterisk and
I'm fighting with a few obstacles.
The app registers with asterisk, I checked this with
shmessage.py and it works fine.
Now the next step was to check the DTMF functions, but
there I'm out of luck.
With asterisk dtmfmode rfc2833
- I get an exeption: can't decode format <PTMarker telephone-event(dynamic)/8000/None at -4859fc74>
with dtmfmode=info
- we have
Content-Type: application/dtmf-relay
Content-Length: 24
Signal=1
Duration=250
but nothing from doug.
same with dtmfmode=inband
Any advice?
And btw. has anybody shtoomcu.py running as an asterisk extension?
I can call in but don't get any client audio back.
Regards,
Frank